支撑剂回流研究进展

Mechanism,prediction and control of Propellant Backflow

压后支撑剂回流有很大的危害性。会使近井地带形成瓶颈裂缝,影响压裂效果;影响油气井正常生产;产出砂腐蚀井下和地面设备。在室内实验的基础上,先后提出了通道理论、砂拱说和瓶颈机理来解释压裂砂返吐现象。从室内实验、理论分析和力学角度出发,分别提出了经验关系法、图版法、临界速度法、半力学法和数值分析法来预测支撑剂回流趋势。随着科学技术的发展,相继提出了树脂砂、纤维、热塑薄带、变形颗粒和支撑剂表面增强剂等控制方法。对于支撑剂回流,应该将重点放在控制技术上,研究新型控制技术,降低控制介质对裂缝导流能力的影响。

Propellant backflow can be detrimentally. It can result in ＂choked＂ fracture near the well and affects production of it, sands produced erode equipments. Channel, arch and pinch-out have been used to interpret back production of propellant. Many prediction models include empirical, theoretical, semi-mechanistic and numeric models have been developed to predict the occurrence of propellant backflow. Propellant backflow can be avoid by addition or tail-in of resin coated propellant, fiber, thermoplastic film trips, deformable particles and surface modification agent. More attention should be paid to develop new media which have no detrimental to facture conductivity.